Re: Back for more..VEXpro 2014 Product Unveiling
 

I can't seem to find a CAD file for the versablocks on either site, has anyone found this?

Re: Back for more..VEXpro 2014 Product Unveiling
 

Oops. It's up on our site now on the Versa-Block page, here

Re: Back for more..VEXpro 2014 Product Unveiling
 

If VEX/WCP sold a $399 transmission with two CIM motors attached to it at a cost of $457, would you think that it violates the single component under $400 rule?

That's how I'd look at it. The piston is an externally attached COTS item that is being included for your convenience.

Re: Back for more..VEXpro 2014 Product Unveiling
 

And West Coast Products :)

Re: Back for more..VEXpro 2014 Product Unveiling
 

West Coast Products too! I haven't purchased from you guys before, I might have to give some of your items a try this year.

Re: Back for more..VEXpro 2014 Product Unveiling
 

The part that makes it legal is that the PTO is an add-on to an already, independently functional part. The gearbox can be used without the PTO and be fully functional So can the pneumatic cylinders. 2 of the 3 modules we're talking about (pneumatics, PTO, and gearbox) are usable in multiple configurations, so I don't think it falls into the trap of "modules are designed to assemble into a single configuration, and the assembly is functional in only that configuration"

Re: Back for more..VEXpro 2014 Product Unveiling
 

Hi Sean,
Unfortunately, I don't have a data sheet to back this up. We spoke directly with a few belt manufacturers, off the record on this topic.

Of course those users who would prefer GT2 belts can purchase them from any number of suppliers. VEXpro has chosen HTD based on the feedback we received, and some simple preliminary testing.

If you have any concerns, feel free to email prosupport@vex.com to discuss further.

-John

Re: Back for more..VEXpro 2014 Product Unveiling
 

While I don't have numbers to back this up, 256 made a belt drive in the offseason and tried out both HTD and GT2 belts and pulleys, and while the GT2 ratcheted when we went full forward to full reverse, the HTD stayed strong and kept its hold on the drive. I would definitely go with HTD again.

Re: Back for more..VEXpro 2014 Product Unveiling
 

Alpha Beta,
Good question. Of course -- we cannot comment on 2014 legality, but I appreciate your question was asked in reference to the 2013 rules:

The PTO shaft and associated components (VersaDog, etc) are easy to use by themselves without purchase of the entire WCD Dual Speed Gearbox. These items are sold as part of the 217-3636 kit for $74.99:
http://www.wcproducts.net/wcp-shifter-components/

Based on our interpretation of the 2013 rules, we believe these would have been legal for use last season, if they were around then. :)

-John

Re: Back for more..VEXpro 2014 Product Unveiling
 

I thought the tiny new hex broached VersaWheel was pretty cool. What led you guys to making it 3.25" in diameter? I'm glad it is available!

Re: Back for more..VEXpro 2014 Product Unveiling
 

So they can continue to make their drive modules lighter and more compact?

Re: Back for more..VEXpro 2014 Product Unveiling
 

Could you post more information about your setup? Tooth count of both systems, pulley material, use of tensioners vs exact center, etc. We've had almost the exact opposite experience, but our experience is probably possibly user error rather than an accurate comparison.

Re: Back for more..VEXpro 2014 Product Unveiling
 

Given that HTD is at this point a de-facto standard while GT2 is a proprietary profile*, I don't think a lot of belt manufacturers would want to go on the record with an unbiased recommendation. Gates is going to say that GT2 is the way to go, while everyone else will say HTD.

In reality, a wise designer would probably want to have enough of a safety margin that either profile would not ratchet.

* A brief Google search couldn't confirm or deny this, but it is my recollection. I'm sure that CD will correct my statement if it is incorrect :)

Re: Back for more..VEXpro 2014 Product Unveiling
 

I meant more like is it intended for drive systems, or can we expect a line of smaller wheels coming out soon to compete with Banebots wheels for grippers and intakes and such. If so, that would be very cool.

Re: Back for more..VEXpro 2014 Product Unveiling
 

Jared,

I would agree with your statement completely. We on 2168 used the GT2 extruded stock and machined our own press fit colson hubs to drive GT2 15mm belts. We designed our wheel spacing for exact C-C distances for belt lengths supplied by SDP-si.

After about 60 hours of vigours driver practice including pushing matches practicing defense before bag and 7 competitions (on and off season), we have been still using the same exact belts in practice all fall and under finger pressure the belts will stretch no more than a .5 inches. Also despite our best efforts we have never produced the "ratcheting" effect.

We also used HTD back in 2012 for our shooter, and again designed with the proper C-C distances for a specific belt size, and once again after many hours of use, never had an issue with ratcheting. That robot was in a fundraiser last week with same belt and still shoots like a charm. :-)

In short, based on our experience, I would agree with JVN that both will do the job, just fine. But of course if you have the option you should buy HTD ;-)